python - ODBC SQL type -155 is not yet supported

Question

I follow this link to query Azure database.

import pyodbc
server = 'your_server.database.windows.net'
database = 'your_database'
username = 'your_username'
password = 'your_password'
driver= '{ODBC Driver 13 for SQL Server}'
cnxn = pyodbc.connect('DRIVER='+driver+';PORT=1433;SERVER='+server+';PORT=1443;DATABASE='+database+';UID='+username+';PWD='+ password)
cursor = cnxn.cursor()
cursor.execute("SELECT * FROM FinancialRecord where deleted=0")
row = cursor.fetchone()
while row:
    print (str(row[0]) + " " + str(row[1]))
    row = cursor.fetchone()

When I run the code above, it show the error.

Traceback (most recent call last): File "sqltest.py", line 10, in row = cursor.fetchone() pyodbc.ProgrammingError: ('ODBC SQL type -155 is not yet supported. column-index=2 type=-155', 'HY106')

I am new to Azure. Anyone can help?

Answer 1

pyodbc supports Output Converter functions that we can use when a database returns an SQL type that pyodbc does not support natively. The example on the Wiki page linked above will perform a client-side conversion similar to what would be achieved by a CAST to [N]VARCHAR on the server:

import struct
import pyodbc
conn = pyodbc.connect("DSN=myDb")


def handle_datetimeoffset(dto_value):
    # ref: https://github.com/mkleehammer/pyodbc/issues/134#issuecomment-281739794
    tup = struct.unpack("<6hI2h", dto_value)  # e.g., (2017, 3, 16, 10, 35, 18, 0, -6, 0)
    tweaked = [tup[i] // 100 if i == 6 else tup[i] for i in range(len(tup))]
    return "{:04d}-{:02d}-{:02d} {:02d}:{:02d}:{:02d}.{:07d} {:+03d}:{:02d}".format(*tweaked)


crsr = conn.cursor()
# create test data
crsr.execute("CREATE TABLE #dto_test (id INT PRIMARY KEY, dto_col DATETIMEOFFSET)")
crsr.execute("INSERT INTO #dto_test (id, dto_col) VALUES (1, '2017-03-16 10:35:18 -06:00')")

conn.add_output_converter(-155, handle_datetimeoffset)
value = crsr.execute("SELECT dto_col FROM #dto_test WHERE id=1").fetchval()
print(value)

crsr.close()
conn.close()

which prints

2017-03-16 10:35:18.0000000 -06:00